2-96761033-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_020184.4(CNNM4):c.34G>C(p.Gly12Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000938 in 1,066,032 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G12C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 9.4e-7 (0 hom.)
• Consequence: CNNM4 NM_020184.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.49

Genes affected

CNNM4 (HGNC:105): (cyclin and CBS domain divalent metal cation transport mediator 4) This gene encodes a member of the ancient conserved domain containing protein family. Members of this protein family contain a cyclin box motif and have structural similarity to the cyclins. The encoded protein may play a role in metal ion transport. Mutations in this gene are associated with Jalili syndrome which consists of cone-rod dystrophy and amelogenesis imperfecta. [provided by RefSeq, Feb 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.34005547).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CNNM4	NM_020184.4	c.34G>C	p.Gly12Arg	missense_variant	1/7	ENST00000377075.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CNNM4	ENST00000377075.3	c.34G>C	p.Gly12Arg	missense_variant	1/7	1	NM_020184.4	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 9.38e-7 AC: 1 AN: 1066032 Hom.: 0 Cov.: 31 AF XY: 0.00000199 AC XY: 1 AN XY: 503418

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000110

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jun 14, 2022

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals affected with CNNM4-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the gnomAD database. This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 12 of the CNNM4 protein (p.Gly12Arg). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Uncertain	0.021	T
BayesDel_noAF	Benign	-0.21
Cadd	Benign	16
Dann	Benign	0.87
DEOGEN2	Benign	0.026	T
Eigen	Benign	-0.54
Eigen_PC	Benign	-0.59
FATHMM_MKL	Benign	0.42	N
LIST_S2	Benign	0.45	T
M_CAP	Pathogenic	0.79	D
MetaRNN	Benign	0.34	T
MetaSVM	Benign	-0.89	T
MutationAssessor	Benign	1.7	L
MutationTaster	Benign	1.0	N
PrimateAI	Pathogenic	0.87	D
PROVEAN	Benign	-0.35	N
REVEL	Benign	0.10
Sift	Benign	0.16	T
Sift4G	Uncertain	0.060	T
Polyphen		0.43	B
Vest4		0.35
MutPred		0.29		Gain of MoRF binding (P = 0.0035);
MVP		0.66
MPC		1.2
ClinPred		0.18	T
GERP RS		1.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.0
Varity_R		0.084
gMVP		0.43

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-97426770;